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Create a Subnet

Overview​

A subnet represents a distinct CIDR block containing a range of IP addresses within a VPC. All resources deployed in a VPC must reside on subnets.

Key points:

  • Instances across different subnets within the same VPC can communicate by default.
  • Once created, a subnet's CIDR block is immutable. Subnets sharing a VPC must not have overlapping CIDR ranges.
  • Creating a GPU VM requires an active Subnet in the VPC. The system auto-assigns a Private IP from that subnet to the VM.

Step-by-Step​

Step 1: Navigate to Networking → Subnets in the left-side menu, then select Create Subnet.

Step 2: Enter a name for the subnet in the Name field.

Step 3: Choose the subnet type. Two types are supported:

  • Routed: The subnet is routed to the internet via a NAT gateway.
  • Isolated: The subnet has no internet routing.

Step 4: Define the IP range using CIDR notation (e.g., 172.30.65.0/24) in the Network Address (CIDR) field.

Step 5: Specify the default gateway IP within the subnet via Gateway IP. Typically the first usable IP (e.g., 172.30.65.1).

Step 6: Define a Static IP Pool — a reserved range of IPs designated for static assignments.

Step 7: Configure DNS settings by specifying DNS server IPs for domain resolution:

  • Primary DNS: Required server for resolving domain names.
  • Secondary DNS (optional): Fallback server if the primary becomes unavailable.

Step 8: Assign a Tag to help categorize or organize the subnet.